High strength galvanized steel sheet with excellent formability and method for manufacturing the same

A hot-dip galvanized steel sheet with excellent workability. It is used in manufacturing tools, heat treatment furnaces, heat treatment equipment, etc. It can solve the problems of increased hardness difference and poor stretch flangeability during hole reaming, so as to promote weight reduction. , The effect of improving corrosion resistance

Inactive Publication Date: 2011-01-05
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since such DP steel or TRIP steel contains soft ferrite, a large amount of alloy elements are required to achieve high strength with a TS of 980 MPa or mo

Method used

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  • High strength galvanized steel sheet with excellent formability and method for manufacturing the same
  • High strength galvanized steel sheet with excellent formability and method for manufacturing the same
  • High strength galvanized steel sheet with excellent formability and method for manufacturing the same

Examples

Experimental program
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Embodiment

[0074] Steels A to P with the composition shown in Table 1 were smelted in a converter, and cast into slabs by continuous casting, hot rolled at a finish rolling temperature of 900°C to a plate thickness of 3.0mm, and cooled at 10°C / sec after rolling. Cooling at a high speed and coiling at a coiling temperature of 600°C. Next, after pickling, it is cold rolled to a plate thickness of 1.2 mm, annealed in the annealing conditions shown in Table 2 and 3 through a continuous hot-dip galvanizing production line, and then immersed in a plating bath at 460 ° C to form a thickness of 35 ~ 45g / m 2 The coated layer was alloyed at 520° C. and cooled at a cooling rate of 10° C. / second to produce coated steel sheets 1 to 30. In addition, as shown in Tables 2 and 3, alloying treatment was not performed on some plated steel sheets. Then, with respect to the obtained plated steel sheet, the area ratios of ferrite, martensite, and tempered martensite, and the ratio of retained austenite were m...

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Abstract

A high-strength hot-dip galvanized steel sheet with excellent processability is provided which has a TS of 1,200 MPa or higher, El of 13% or higher, and hole expansion ratio of 50% or higher. Also provided is a process for producing the steel sheet. The high-strength hot-dip galvanized steel sheet with excellent processability has a composition comprising, in terms of mass%, 0.05-0.5% carbon, 0.01-2.5% silicon, 0.5-3.5% manganese, 0.003-0.100% phosphorus, up to 0.02% sulfur, and 0.010-0.5% aluminum, with the remainder being iron and incidental impurities, and has a microstructure comprising, in terms of areal proportion as determined through a structure examination, 0-10% ferrite, 0-10% martensite, and 60-95% tempered martensite and containing, in terms of proportion as determined by X-ray diffractometry, 5-20% retained austenite.

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet with excellent workability used in industrial fields such as automobiles and electric power. In particular, it relates to a steel sheet having a tensile strength TS of 1200 MPa or more and an elongation E1 of 13% or more and having a tensile flangeability A high-strength hot-dip galvanized steel sheet with a hole expansion rate of more than 50% and a manufacturing method thereof. Background technique [0002] In recent years, improving the fuel efficiency of automobiles has become an important issue from the viewpoint of protecting the global environment. Therefore, studies are being made to reduce the weight of the vehicle body itself by increasing the strength and reducing the thickness of the steel plate used as the material of the vehicle body. However, generally, the increase in the strength of the steel sheet leads to a reduction in the ductility of the steel sheet, ...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D9/46C22C38/06C22C38/58
CPCC21D8/0463C21D8/0426C22C38/02C21D2211/008C22C38/06C21D1/25C21D6/005C21D6/008C21D2211/005C22C38/04C21D8/0436C21D2211/002Y10T428/12799
Inventor 中垣内达也松冈才二铃木善继田路勇树
Owner JFE STEEL CORP
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